Models of gauge mediated supersymmetry breaking (GMSB) provide a
concrete example of a large class of models that obey a simple
principle called minimal flavour violation (MFV)
[1]}. This principle guarantees that low-energy
flavour-changing processes deviate only very little from the SM
predictions. The basic idea can be described as follows. The gauge
interactions of the SM are universal in flavour space. The only
breaking of this flavour universality comes from the three Yukawa
matrices, \(Y_U\) , \(Y_D\) , and \(Y_E\) . If this remains true in the
presence of the new physics, namely \(Y_U\) , \(Y_D\) , and \(Y_E\)  are the
only flavour non-universal parameters, then the model belongs to the
MFV class.
